Qubits articles within Nature

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  • Article
    | Open Access

    Using a cryogenic 300-mm wafer prober, a new approach for the testing of hundreds of industry-manufactured spin qubit devices at 1.6 K provides high-volume data on performance, allowing optimization of the complementary metal–oxide–semiconductor (CMOS)-compatible fabrication process.

    • Samuel Neyens
    • , Otto K. Zietz
    •  & James S. Clarke

  • Article
    | Open Access

    A micro-fabricated Penning trap that operates at a 3 T magnetic field demonstrates full quantum control of an ion and the ability to transport the ion arbitrarily in the trapping plane above the chip.

    • Shreyans Jain
    • , Tobias Sägesser
    •  & Jonathan Home

  • Article
    | Open Access

    A scheme to prepare a magic state, an important ingredient for quantum computers, on a superconducting qubit array using error correction is proposed that produces better magic states than those that can be prepared using the individual qubits of the device.

    • Riddhi S. Gupta
    • , Neereja Sundaresan
    •  & Benjamin J. Brown

  • Article
    | Open Access

    A programmable quantum processor based on encoded logical qubits operating with up to 280 physical qubits is described, in which improvement of algorithmic performance using a variety of error-correction codes is enabled.

    • Dolev Bluvstein
    • , Simon J. Evered
    •  & Mikhail D. Lukin

  • Article
    | Open Access

    The realization of two-qubit entangling gates with 99.5% fidelity on up to 60 rubidium atoms in parallel is reported, surpassing the surface-code threshold for error correction and laying the groundwork for neutral-atom quantum computers.

    • Simon J. Evered
    • , Dolev Bluvstein
    •  & Mikhail D. Lukin

  • Article |

    Er3+ is implanted into CaWO4, a material with non-polar site symmetry free of background rare earth ions, to realize reduced optical spectral diffusion in nanophotonic devices, representing a step towards making telecom band quantum repeater networks with single ions.

    • Salim Ourari
    • , Łukasz Dusanowski
    •  & Jeff D. Thompson

  • Article |

    Spectroscopic measurements of individual rare-earth ion electron spins are performed by detecting their microwave fluorescence, with the method coming close to practical single-electron spin resonance at millikelvin temperatures.

    • Z. Wang
    • , L. Balembois
    •  & E. Flurin

  • Article
    | Open Access

    A unitary protocol for braiding projective non-Abelian Ising anyons in a generalized stabilizer code is implemented on a superconducting processor, allowing for verification of their fusion rules and realization of their exchange statistics.

    • T. I. Andersen
    • , Y. D. Lensky
    •  & P. Roushan

  • Article
    | Open Access

    A loophole-free violation of Bell’s inequality with superconducting circuits shows that non-locality is a viable new resource in quantum information technology realized with superconducting circuits, promising many potential applications.

    • Simon Storz
    • , Josua Schär
    •  & Andreas Wallraff

  • Article
    | Open Access

    In this alternative approach to quantum computation, the all-electrical operation of two qubits, each encoded in three physical solid-state spin qubits, realizes swap-based universal quantum logic in an extensible physical architecture.

    • Aaron J. Weinstein
    • , Matthew D. Reed
    •  & Matthew G. Borselli

  • Article |

    Using particle-by-particle assembly and adiabatic manipulation of disorder, low-entropy, strongly correlated quantum fluids of light are constructed, opening up new possibilities for the preparation of exotic phases of synthetic matter.

    • Brendan Saxberg
    • , Andrei Vrajitoarea
    •  & David I. Schuster

  • Article
    | Open Access

    The universal control of six qubits in a 28Si/SiGe quantum dot array is demonstrated, achieving Rabi oscillations for each qubit with visibilities of 93.5–98.0%, implying high readout and initialization fidelities.

    • Stephan G. J. Philips
    • , Mateusz T. Mądzik
    •  & Lieven M. K. Vandersypen

  • Article
    | Open Access

    By using three silicon spin qubits to construct a phase-correcting code, quantum error correction is implemented and protection of the three-qubit state against any phase-flip error on one of the three qubits is demonstrated.

    • Kenta Takeda
    • , Akito Noiri
    •  & Seigo Tarucha

  • Article |

    Individually addressable ‘T centre’ photon-spin qubits are integrated in silicon photonic structures and their spin-dependent telecommunications-band optical transitions characterized, creating opportunities to construct silicon-integrated, telecommunications-band quantum information networks.

    • Daniel B. Higginbottom
    • , Alexander T. K. Kurkjian
    •  & Stephanie Simmons

  • Article |

    By using 17 physical qubits in a superconducting circuit to encode quantum information in a surface-code logical qubit, fast (1.1 μs) and high-performance (logical error probability of 3%) quantum error-correction cycles are demonstrated.

    • Sebastian Krinner
    • , Nathan Lacroix
    •  & Andreas Wallraff

  • Article |

    Via spin-exchange interactions with 51V5+ ions, an optically addressed 171Yb3+ qubit in a nuclear-spin-rich yttrium orthovanadate crystal is used to implement a reproducible nuclear-spin-based quantum memory, and entangled Yb–V Bell states are demonstrated.

    • Andrei Ruskuc
    • , Chun-Ju Wu
    •  & Andrei Faraon

  • Article |

    Entangled pairs of fermionic atoms in an optical lattice array have long-lived motional coherence, and the motion of each pair results in a robust qubit, protected by exchange symmetry.

    • Thomas Hartke
    • , Botond Oreg
    •  & Martin Zwierlein

  • Article |

    Single- and two-qubit gate fidelities above the fault-tolerance threshold for quantum computation are demonstrated in silicon quantum dots by fast electrical control using a micromagnet-induced gradient field and tunable coupling.

    • Akito Noiri
    • , Kenta Takeda
    •  & Seigo Tarucha

  • Article |

    Universal quantum logic operations with fidelity exceeding 99%, approaching the threshold of fault tolerance, are realized in a scalable silicon device comprising an electron and two phosphorus nuclei, and a fidelity of 92.5% is obtained for a three-qubit entangled state.

    • Mateusz T. Mądzik
    • , Serwan Asaad
    •  & Andrea Morello

  • Article |

    Fault-tolerant circuits for the control of a logical qubit encoded in 13 trapped ion qubits through a Bacon–Shor quantum error correction code are demonstrated.

    • Laird Egan
    • , Dripto M. Debroy
    •  & Christopher Monroe

  • Article |

    The quantum charge-coupled device architecture is demonstrated, with its various elements integrated into a programmable trapped-ion quantum computer and performing simple quantum operations with state-of-the-art levels of error.

    • J. M. Pino
    • , J. M. Dreiling
    •  & B. Neyenhuis

  • Article |

    Using germanium quantum dots, a four-qubit processor capable of single-, two-, three-, and four-qubit gates, demonstrated by the creation of four-qubit Greenberger−Horne−Zeilinger states, is the largest yet realized with solid-state electron spins.

    • Nico W. Hendrickx
    • , William I. L. Lawrie
    •  & Menno Veldhorst

  • Article
    | Open Access

    A nondestructive detector of photonic qubits, comprising a single 87Rb atom trapped in the centre point of two crossed fibre-based optical resonators, is demonstrated.

    • Dominik Niemietz
    • , Pau Farrera
    •  & Gerhard Rempe

  • Article |

    High-fidelity deterministic quantum state transfer and multi-qubit entanglement are demonstrated in a quantum network comprising two superconducting quantum nodes one metre apart, with each node including three interconnected qubits.

    • Youpeng Zhong
    • , Hung-Shen Chang
    •  & Andrew N. Cleland

  • Article |

    Two logical qubits are encoded in ensembles of four physical qubits through the surface code, then entangled by lattice surgery, which is a protocol for carrying out fault-tolerant operations.

    • Alexander Erhard
    • , Hendrik Poulsen Nautrup
    •  & Thomas Monz

  • Article |

    A chip-scale platform is developed for the conversion of a single microwave excitation of a superconducting qubit into optical photons, with potential uses in quantum computer networks.

    • Mohammad Mirhosseini
    • , Alp Sipahigil
    •  & Oskar Painter

  • Article |

    A fundamental superconducting qubit is introduced: ‘blochnium’ is dual to the transmon, relies on a circuit element called hyperinductance, and its fundamental physical variable is the quasicharge of the Josephson junction.

    • Ivan V. Pechenezhskiy
    • , Raymond A. Mencia
    •  & Vladimir E. Manucharyan

  • Article |

    A deterministic correction of errors caused by qubit loss or leakage outside the computational space is demonstrated in a trapped-ion experiment by using a minimal instance of the topological surface code.

    • Roman Stricker
    • , Davide Vodola
    •  & Rainer Blatt

  • Article |

    Ionizing radiation from environmental radioactivity and cosmic rays increases the density of broken Cooper pairs in superconducting qubits, reducing their coherence times, but can be partially mitigated by lead shielding.

    • Antti P. Vepsäläinen
    • , Amir H. Karamlou
    •  & William D. Oliver

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